20 
BULLETIN 347, U. S. DEPARTMENT OF AGRICULTURE. 
pressure is just sufficient to raise the lever arm. This will take about 
30 seconds. The weight on the lever arm should be so adjusted that 
there will be a maximum pressure on the briquette of 132 kilograms 
Xf 
y=>JL^f/^f 
Fig. 11.— Details of Page impact machine for testing cementing value. 
per square centimeter. At the moment the lever arm is raised the 
pressure should be released. The briquette is then removed as shown 
in figure 10 and its height carefully measured. Add or subtract 1 
